A welding system that, using a junction at which a standing plate and a bottom plate meet as a welding line, makes an electrode weave centered on the welding line and thereby welds along the welding line. While weaving, the electrode moves forward in a welding advancement direction until a bottom-plate-side weaving edge. When the electrode arrives at the bottom-plate-side weaving edge, the electrode moves backward with respect to the welding advancement direction until a standing-plate-side weaving edge. The electrode repeats this weaving motion on the bottom-plate side and on the standing-plate side. The system can suppress occurrence of inferior bead appearance and of welding defects in horizontal fillet welding.

A method for welding dissimilar metals is provided. A first metal workpiece and a second metal workpiece having different physical characteristics are provided. A surface of the first metal workpiece and a surface of the second metal workpiece are abutted to form a pre joint surface between the first metal workpiece and the second metal workpiece. The first metal workpiece and the second metal workpiece are welded with a welding apparatus moving substantially along an axis, wherein the axis is offset from the pre-joint surface and proximal to the first metal workpiece than to the second metal workpiece.

A high-heat-load vacuum device and method for manufacturing the same are provided. The high-heat-load vacuum device includes a high-heat-load component and a vacuum component connected to the high-heat-load component. A material of the vacuum component and a material of the high-heat-load component comprise CuCrZr alloy.

Provided is a weaving control method for obtaining an excellent weld quality of various kinds of position welding such as flat welding, horizontal welding, and vertical welding using a portable welding robot that moves on a guide rail. The weaving control method includes: a setting step of setting at least a condition of a weaving reference trajectory relating to a reference distance for determining a weaving pattern; and a speed condition calculation step of calculating a speed condition for giving an instruction to a robot movement mechanism that moves the portable welding robot for each of a plurality of predetermined direction components based on the weaving pattern determined based on the setting step, in which an instruction of a stop signal and an instruction of a departure signal to be given immediately after instructing the stop signal or after the lapse of a predetermined stop time are synchronized with the speed condition of each of the plurality of direction components calculated in the speed condition calculation step at least when a weaving end is reached.

An infrared vision sensing detection method and device for narrow-gap weld seam deviation are provided. The device includes a shaking (or rotating) arc narrow-gap welding torch, an arc current sensor, a computer image processing system, and an infrared photographing system. The infrared photographing system includes an infrared camera which acquires an infrared image of a welding region in an external triggering manner when an arc shakes (or rotates) to a position closest to the left side wall or right side wall of a groove. After computer image processing, a welding wire position and a groove edge information is extracted in real time, and a weld seam deviation is calculated according to position changes of a welding wire relative to the left side wall and the right side wall of the groove, and the weld seam deviation is output. During pulsed arc welding, a signal in a base value period of the arc current pulse is detected by using the current sensor, thereby realizing welding image acquisition synchronized with the base value current period of the pulsed arc.

Apparatuses, systems, and/or methods for welding systems that provide independent control of a contact tip of a welding torch are disclosed. The welding system can include, for example, a welding torch that includes, for example, a contact tip and a pivot in which the contact tip is coupled to the pivot and is configured to provide wire that is fed through the welding torch during a welding operation. The contact tip and the pivot are configured to independently move the contact tip of the welding torch around the pivot during the welding operation.

Disclosed are an infrared vision sensing detection method and device for narrow-gap weld seam deviation. The device includes a shaking (or rotating) arc narrow-gap welding torch, an arc current sensor (3), a computer image processing system (15), and an infrared photographing system. An infrared camera (11) acquires an infrared image of a welding region in an external triggering manner when an arc (1) shakes (or rotates) to a position closest to the left side wall or right side wall of a groove (9). After computer image processing, welding wire position and groove edge information is extracted in real time, and weld seam deviation is calculated according to position changes of a welding wire relative to the left side wall and the right side wall of the groove, and the weld seam deviation is output. During pulsed arc welding, a signal in a base value period of the arc current pulse is detected by using the current sensor, thereby realizing welding image acquisition synchronized with the base value current period of the pulsed arc. The device has a simple constitution, a wide application range, high weld seam detection precision, high environment adaptability, and high anti-interference capability.

A method of and system for steering an arc and/or torch head in a weld joint is provided. The system includes a torch head that creates an arc in a weld groove formed in at least one workpiece. The system also includes a control unit that includes a feedback system that monitors at least one of a voltage of the arc, a current of the arc, a power output of the torch power supply, and a contact tip to weld distance. The control unit outputs a feedback signal corresponding to the monitoring. The control unit also includes a comparison circuit that compares the feedback signal with at least one predetermined value corresponding to a position of at least one of the arc and the torch head in the weld groove. The control unit further includes an arc steering system that outputs a steering signal based on the comparison.

A welding condition generating method in flat position welding is a method for determining welding conditions for welding in a single V groove, a single bevel groove, or a fillet groove in a flat position using a welding robot. The method includes preparing conditions A and B, each including a plurality of different parameters used in calculation for determining the welding conditions; and generating the welding conditions by combining parameters included in the conditions A and B. The condition A includes at least one of the following parameters: a joint shape, a groove shape, a groove angle, a gap width, and the presence or absence of backing. The condition B includes at least one of the following parameters: a welding gas type, a welding wire diameter, a welding wire type, a welding wire extension length, a welding source type, a power source characteristic, and a torch type.

A pulse arc welding profile control method, a control device, a welding system, a welding program, and a welding power supply are provided in which, even when a pulse arc welding method is used, protruding change information is extractable at high accuracy without influence from a welding current or an arc voltage having a pulse shape. An electric change amount detected at the time of weaving includes, as a parameter, at least one among a welding current detection signal and an arc voltage detection signal, takes a predetermined period as one period, calculates an average value of the electric change amount in each one period, and extracts, on the basis of the average value, the protruding change information in a groove to follow a welding line.